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3-D GaAs radiation detectors

Meikle, AR and Bates, RL and Ledingham, K and Marsh, JH and Mathieson, K and O'Shea, V and Smith, KM (2002) 3-D GaAs radiation detectors. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 477 (1-3). pp. 198-203. ISSN 0168-9002

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Abstract

A novel type of GaAs radiation detector featuring a 3-D array of electrodes that penetrate through the detector bulk is described. The development of the technology to fabricate such a detector is presented along with electrical and radiation source tests. Simulations of the electrical characteristics are given for detectors of various dimensions. Laser drilling, wet chemical etching and metal evaporation were used to create a cell array of nine electrodes, each with a diameter of 60 μm and a pitch of 210 μm. Electrical measurements showed I–V characteristics with low leakage currents and high breakdown voltages. The forward and reverse I–V measurements showed asymmetrical characteristics, which are not seen in planar diodes. Spectra were obtained using alpha particle illumination. A charge collection efficiency of 50% and a S/N ratio of 3 : 1 were obtained. Simulations using the MEDICI software package were performed on cells with various dimensions and were comparable with experimental results. Simulations of a nine-electrode cell with 10 μm electrodes with a 25 μm pitch were also performed. The I–V characteristics again showed a high breakdown voltage with a low leakage current but also showed a full depletion voltage of just 8 V.

Item type: Article
ID code: 37545
Notes: 5th International Conference on Position-Sensitive Detectors, UNIV COLL LONDON, LONDON, ENGLAND, SEP 13-17, 1999
Keywords: radiation detectors , GaAs radiation detectors , electrodes, Optics. Light
Subjects: Science > Physics > Optics. Light
Department: Faculty of Science > Physics
Faculty of Science > Institute of Photonics
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 09 Feb 2012 16:15
    Last modified: 12 Mar 2012 11:46
    URI: http://strathprints.strath.ac.uk/id/eprint/37545

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